"I ran into her recently at a party. She wasn't the nicest," Ciara, 25, said on TV. "It's crazy, because I've always loved and respected what she's done in fashion. It wasn't the most pleasant run-in."

A true twenty-first century diva, Rihanna, 22, tweeted her response.

“My bad Ci, did I forget to tip you? How rude of me....You gangsta huh? Ha,” the “S&M” singer wrote.

Ciara shot back: “Trust me Rihanna you don't want to see me on or off the stage.”

To which Rihanna, the more popular of the two stars both on and off Twitter, sniped: “Good luck with bookin that stage you speak of."

And so it went. Eventually Rihanna took the high road with what amounted to a virtual hug.